Effects of Mechanical Index on Repeated Sparse Activation of Nanodroplets In Vivo - Zhang, G; Toulemonde, M; Riemer, K; Zhu, J; Harput, S; Christensen-Jeffries, K; Zhu, Z; Wang, B; Leow, CH; Weinberg, P; Dunsby, C; Tang, M-X (IEEE, 2020)